Blind stitch sewing machine



Jan. 22, 1935. I c. w. MUELLER 1,988,563

BLIND STITCH SEWING MACHINE Filed April 10, 1933 2 Sheets-Sheet l a 29 2 25 22 6% W 3nver ptor (Ittorneg Jan. 22, 1935. c w MUELLER 1,988,563

BLIND STITCH SEWING MACHINE I Filed April 10, 1935 2 Shets-SheetZ Patented Jan. 22, 1935 UNITED STATES I 1,9ss,se3-" BLIND s'ri'ron' ,SEWING MACHINE Charles W. Mueller, St. Ilouis,'Mo.', assignor to Lewis Invisible' Stitch Machine Company st. V

-Louis Mo acorp'oration of Maine V I I Application April 10, 1933, sesame.66591235]..i gl

16Clai msa (cr me-478) Thisinvention relates to new. and useful im-.- provements in sewing machines generally, al-.

though particularly to machines for blind stitching hems along the bottoms of skirts and other 5 articles of wearing apparel, V

.In blind :stitch -'sewingmachines as heretofore constructed for performing hemming operations,

the hem and the adjacent portion of the :body.

fabric. are elevatedby the'ridge forming. device immediately prior to each needle penetrating stroke whereby the needle first enters the body fabric andthen the hem, the hem thus receiving thethrust of the needle. When performing'this. hemming operation .011 light weight fabrics, the.

hem lacks suilicient rigidity to properly resist the needle penetration and consequently the needle may either fail at times to enter the hem or at othertiinesenter the hem at diiierent dis tances from the-hem fold, thereby creating irregular line of stitches.

Among the objects of this invention are to provide aiblind stitch sewing machine having a hemmer and provided with means for. supporting the hem against the thrust of the needle whereby the latter willwith certainty enter the hem at;

the same 'pointslrelative to the hem fold during each penetrating stroke of the needle; to' provide a yieldable hem supporting means whereby: a'hem having a cross seam therein may be fed past the:

needle and properly supported during said pas-' sage against the thrust of the needle; to provide such-a supporting means with a manually oper- -able devicefor movinglsaid supporting means laterally against the tension of'the yieldable I means to accommodate the machine to different weights of materials; and to provide such a supporting means which is simple in construction.

and is easily attached to the stationary presser foot of the machine. t

With these and other objects in view which will more fully appeargthe natureof the invention will be-more clearly understood by following'the description, the appended claims, and the several views illustrated in the accompanying drawings.)

In the drawings:- Figure lris an end elevation of a blind stitch sewing machine equipped with my invention,

Figure 2 is a horizontal view taken directly above the stationary'presser foot,

Figure 3 is a top plan-view of the presser foot, I. Figure 4 is a bottom plan view thereof,

Figure 5-is a transverse sectional view'taken on the line 55 of Figure 3, v Figure 6 is a detail view partly in front elevation and" partly in section showing the relation betweenjthe presser' foot, the eedle; theridge forming; device, the: hemmed. .fabric, the work clamp, the feed dog, and the hem:supp0rting means, and 1 '1 Figure;'Lisaperspectiveqview of the hemsup -5- porting means; J i

Like referencenumeralsdesignate correspond-i ing parts throughout the severalhgures' of j the drawings.

.-R.eferri-ng tO'fthl-I accompanying. drawings; 10,

is-also' provided directly in--rear of the opening. 6 20;,

witha' feed'1-slot-8 whichzis dividedfrom. said'i opening by abridge: Qhaving a longitudinal groove 10in its'un'derface. i w l. i As previously stated, myinvention is adapted to/form a heminitherbody fabric and blind stitch 25' said hem-tothe body fabric; In the. present ins? stance, I have disclosed a single thread :stitch forming mechanismfor blind stitching; hems; but: rwishxit to be understood. that any other stitch formin'g mechanism may be employed-.ifdesired; 30.1.

In the present instance, the single threadstitch forming .mechanism. includes a curved needle '11 Whichis'fixedto'an oscillatory needle arm 12 mounted on the stitchinghead and driven from the main shaft .of the -machine. in the usual man."v 35;

her. i Theneedle. 11- has itspenetrating movement acrossnthe: line-of -feed-,of ;the fabric-' and in aplane directly above the opening 6 of the foot. Cooperating withithe needle toaform a line of single thread chain stitchesis a looper'l3 which, 40-: I

is'mounted on the stitching head A and has its movements imparted thereto from the main shaftof the machine through the usual driving connections; Disposed above and supported on the work arm B is a fiat work; plate '14. A hemmer' 45'.

15is rigidly. although adjustably mounted on the work plate 14 at-a point-infront of thepresser foot 5, the nose of the hemmerprojecting' rear-.- wardly and havingrit's'delivery end IOcated i'm-J mediately in front of the opening 6 of the foot'; 50

Disposed below thepresser foot and cooperating therewith is a work presenting mechanism which includes the usual vertically reciprocatory work clamp 16, ar4-motionfeed dog:17,- anda verti cally reciprocatory ridgeiformingl element 18,;55-

3 non;

all being of the usual construction and operated in the manner described in my co-pending application referred to above. It will be noted that the ridge forming element or plunger 18 operates in the presser foot opening 6 immediately under the path of needle travel and that the main feed dog 1'7 engages the body fabric and feeds the Y same rearwardly from the hemmer 15 past the ridge forming element 18 and, needle 11. It will also be observed, as shown particularly in Figure 6, that the ridge forming element 18 elevates the hem 19 and the adjacent portion of the body fabric 20 into needle penetrating position wherein rear of the finger so as-to permit said'wall orfinger 21 to be moved back and forth across ,the'.

opening 6-of the footfThefinger 21 isithus'located in the presser foot opening 6 on theside ofthe ridge forming-element 18 opposite the point of needle penetrationin the hem, and is provided inits side face adjacent the "ridge formingi'element with a hem-receiving groove 21. A'flat spring 24 is attached by .a screw 25 to thead-' jacent side of the foot and the free end of this spring engages in=afslot 26' formed in the arm 22 and functions to yieldably urge the fingeruori wall 21 toward the ridge forming element 18. In order to positively adjust the finger in the opposite direction to accommodate materials of different weights,I have providedthe arm 22 with an upstanding lug 2'7 which is located at one-side of the foot and is provided with a threadediopening 28 for receiving an adjusting screw 29 which cooperates with the radjacentiside wallof the" foot to swing the finger or wall 21 outwardly against the tension of the spring 24-.-

In operation the fabric 20 .is fed through the sewing' machin'e in theusual manner-and a hem 19isfo'rmed in thefabric by the hemmer 15. This hem passes to the right of the ridge forming ele-. ment or plunger 18, and as shown in Figurefi theplunger intermittentlyelevates the hem and the adjacent portion of the body fabric whereby the same is formed into a'ridge which is entered by the need1e' 1'1,.'the.latter first entering the body fabric and then-the hem. When theneedle penetrates the hem, the latter issupported against the thrust of the needle by the ringer or wall 21,

and by means; of the spring24 the finger yields laterally whenever a cross seam in' the body fab ric is fed past said fingen' By means" of the adjusting screw 29' the position of the finger 21 may be adjusted to accommodate fabrics having different weights andthicknesses. It will furthermore be observed that the' yieldablefinger 21 is normally urged toward the ridge'forming element 18 and consequently the hem '19 is firmly clamped between the finger and the elemen during the penetrating strokeof the needle; 1

- It is of course td-beiihderstoo'd that the details ofstructure and arrangement of parts may be variously changed and modified without de parting fromthe spirit'tand "scope of my inven- Iiclaim:+ Q, i '7 Q :1. In a blindstitch's'ewingmachine,the com-' bination with a stationary presser foot having an opening extending rearwardly'from the front edge thereof for receivingia ridge ofmateria1,

19 against theof a feeding means cooperating with the foot to feed the material rearwardly, a stitch forming mechanism including a reciprocatory needle disposed above the opening in the foot and having its penetrating stroke extending in a plane across said opening, a hemmer disposed in front of the foot and having its delivery nose located immediately in front of said opening, aridge forming element for projecting, a ridge of hemmed material upwardly through the opening in the foot and into the path of movement of the needle whereby the needle will first enter the body fabric-and then the hem, and means located in theopening of the foot on the side of the ridge forming element opposite the point of needle penetration in the hem to support the latter against the thrust of the needle.

2. In a blind stitch sewing machine, the combination with a stationary presser foot having an opening extending rearwardly from the front edge thereof for receiving a ridge of material, of

a feeding means cooperating with the foot to feed the material rearwardly, a stitch forming mechanismincludinga reciprocatory needle disposed above the opening in the foot'and having its penetratingstroke"extending in a plane across said opening, a hemmer disposed in front of the body fabric and then the hem, a-fingermovably located in the presser foot opening on the side of the ridge forming element opposite the point of needle'penetration in the hem to support the latterxagain'st the thrust of the needle, and a spring for" normally urging the finger toward the ridge forming element.

In a'blind stitch'sewing machine, the combination with a stationary presser foot having an opening extending rearwardly from the front edge thereof for receiving a ridge of material, of a feeding means cooperating with the foot to feed the material rearwardly, a stitch forming mechanism including a reciprocatory needle disposed above the opening in the foot and having its penetratingstroke extending in a plane across said opening, a hemmer disposed in front of the foot and having its delivery nose located immediately in front of saidopening, a ridge forming element for projecting a ridge of hemmed material upwardly through the opening in the foot and into the path of movement'of theneedle whereby the needle will first enter the body fabric and then the hem, a finger movably located in the presser foot opening on the side of the ridge forming element opposite-the point of needle penetration in the hem to support the latter against the thrust of the. needle, a spring for normally urging the finger toward the ridge forming element, and manually adjustable'stop means to variably limit the movement of the finger toward said ridge a feeding means cooperating with the foot to feed the material rearwardly, a stitch forming mechanism including a reciprocatory needle disposed above the opening in the foot and having its penetrating stroke extending in a plane across said'opening, a'hemmer disposed in front of the its penetrating strok meshes foot: and."haringeitsrideliyery those, locatediimmediateltc in frent: ofwsgid: opening, a ridge formif; ins element fer: proiecting-za; ridge); 1 o hemmed. material; upwardly; through thew-openinehgathe feet; and: in ethe net-hot movement efisthemeedle wherehxith needle-wHlfirstententhebody iahric; nd hen; the heme amide-fin er moun ed? err-the Dre f otsa d -loeatedenithe openingzthereot enx he s e'- of :the r d e;iiormin nelementz oppos te the point of needle penetration in the hem tegunnortthelatt he n e beaten with a; state opening ex endineer edseg hereof .i.

andthen the hem; a finger mounted onthefoot' and lpcated in ithe opening thereofron the sidejofw theiridge formingjelement opposite the point. of: needle penetration in the "hem to support the lat: ter. 1: againstaitheiathrust of: the 'needle, a spring;

mbuntedaon: the-foot anda eooperatingiwith fthe feed thermaterialorearwardly, a stitch. formin 4 mechanismzmcluding. a. recinrocatory'needledisneiihaiisiii iiieiimit nese e ere the Q n aid o en n h whereb the needle meter-tn b d and t n the hem dn er m nt nismlinol din aeerethe h strok for projecting a,- ric;lg e;of;hemmed material upwardly through the opening in the foot and into the path of movement of the needle whereby the needle will first enter the body fabric and then the hem, a finger mounted on the foot and located in the opening thereof on the side of the ridge forming element opposite the point of needle penetration in the hem to support the latter against the thrust of the needle, and a spring mounted on the foot and cooperating with the finger to yieldably retain the latter in one extreme position of movement.

'7. In a blind stitch sewing machine, the combination with a stationary presser foot having an opening extending rearwardly from the front edge thereof for receiving a ridge of material, of a feeding means cooperating with the foot to feed the material rearwardly, a stitch forming mechanism including a reciprocatory needle disposed above the opening in the foot and having its penetrating stroke extending in a plane across said opening, a hemmer disposed in front of the foot and having its delivery nose located immediately in front of said opening, a ridge forming element for projecting a ridge of hemmed material upwardly through the opening in the foot and into the path of movement of the needle whereby the needle will first enter the body fabric ,1 where an the heme fin e 9c i l mentopn s ede th reof "or rece yin a ridse at. a eedin n .,,ns; oop ratin w th the; ioeti to teed,

the material ly; astit h-ierminemeem nherit Q mate a1 inwardly throughthe openin ain the.

tent and m thepath: ofmov mentorth needle. th need e will. first ente :bedy fabric, the openin thenreesen ioiot th sideofrther dse term: t th n int: of needlenenet arn th h m,

e fi gei toward the rid eferming: ele- 4 aib ind stitchisewine machin theeom+ H b nat oniw th a-stat ene y-nresserfoot:hev ngerrnd n earwardlr from the front;

preeatery e dle diepo ed th wardly through the opening in the foot and into the path of movement of the needle whereby the needle will first enter the body fabric and then the hem, a finger located in the opening of the presser foot on the side of the ridge forming element opposite the point of needle penetration in the hem, an arm pivotally mounted on the foot in rear of the finger and rigidly connected to the latter, a spring mounted on the foot and coopcrating with the arm for normally urging the finger toward the ridge forming element, and means for positively adjusting the finger in the opposite direction and against the tension of said spring.

10. In a blind stitch sewing machine, the com bination with a stationary presserfoot having an opening extending rearwardly from the front edge thereof for receiving a ridge of material, of a feeding means cooperating with the foot to feed the material rearwardly, a stitch forming mechanism including a reciprocatory needle disposed above the opening in the foot and having its penetrating stroke extending in a plane across said opening, a hemmer disposed in front of the foot and having its delivery nose located immediately in front of said opening, a ridge forming element for projecting a ridge of hemmed material uparmnivota y mounted on the, foQtrinl ear-l o th fin er-r and: ri idly cone id ope ing, a idge orm ng el'einzient:v for projecting a ridge-of, hemmed mat rial .11:

the hem, a finger slocated-in the Zopening of the presser foot on the side of the ridge forming elemnt oppositeithepoint of needle penetration in the hem,'an-i arm locatedbelow and pivotally mounted on the foot in rear: ofthe finger and rigidly connected to the latter, :3. lug extending upwardly frointhearm atone side of the foot, a-Ispring mounted on thelfoot and cooperating withithearm fornormally urging the finger toward the ridgeforming element, and an adjusting screwmounted in the lugfor cooperation with the side of the'foot for positively adjusting the finger against the tension of the spring.

.1 1; In a'blind stitch sewing machine, the combination with'a stationary presser foot having an openingextending rearwardly from the front edg'ethereof for receivingja ridge of material, of a feeding means cooperating with the foot to feed thematerial rearwardly; a stitch forming mechanism in'cluding a reciprocatory needle disposed abovethe opening in the foot and havingits penetrating stroke: extending in a plane across said opening, a hemmer-disposed in front of the foot and having its delivery nose located immediately in front o'f said opening, a ridge forming element for-projecting a ridge-of hemmed vmaterial upwardly through the opening in the foot and into the pathbf movementof the needle whereby the needle will first enter the body fabric and then the hem," a finger movably located in the presser foot cpeningon the side of the ridge forming element opposite the point of needle penetration in the 'hem to support the latter against the thrust of the needle, the 'sideof the finger adjacent the ridge forming element-being formedwith arear wardly extendi nghem-receiving groove, and a spring 'for normally urging the finger toward the ridge forming'element.-=

'12. A presser foot for blind stitch sewing machines having an opening extending rearwardly from its front edge for receiving a ridge of material, a finger movably mounted on the presser foot and loc'at edat'one side of said opening, and a-sprmg for normally urging the finger toward the fot herside of the: opening ing. i

13. 'Apre'ssenfoot for blind'stitch" sewing ma chines having an opening extendingrearwardly from" its front edge for receiving aridge of material, a finger movably mounted on the presser foot and locatedat 'one'side of said opening, a spring for normally urging the finger toward the other side of the 'opening,- and manually adjustable-stop means'to variably limit the movement of thefinger toward said other side of the open- 14.. A presser foot for blind stitch sewing machines having an opening extending rearwardly from its frontedgefor receiving a ridge of material, a finger movably mountedon the presser foot and located at one side of said opening, an arm pivotally mounted on the'ifoot in rear of the finger and rigidly connected to the latter, and a spring mounted onthe foot and cooperating with the arm -for normally urging the fingertoward the other side of the opening.

15. A presser foot for blind stitch sewing ma-' chines having an opening extending rearwardly from its front edge for receiving a ridge of material, a finger movably mounted on the presser foot and located at one side of said opening, an arm pivotally mounted on the foot in rear of the finger and rigidly connected to the latter, a spring mounted on the foot and cooperating with the arm for normallyurging the finger toward the other 'side' of the opening, and means for positively adjusting thefinger in the opposite direction and against the tension of said spring.'

16."A presser foot for blind stitch sewing machines having an opening extending rearwardly from its front edge for receiving a ridge of material, a finger movably mounted on the presser foot and located at one side of said opening, an arm pivotally mounted on the foot in rear of the finger and'rigidly connected to the latter, a spring mounted on the foot and cooperating with the arm for normally urging the finger toward the other side of the opening, and means for positively adjusting thefinger in the opposite direction and CHARLES w, MUELLER. 

